ALU


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ALU

(computer science)

ALU

(processor)

ALU

(body)

ALU

(Arithmetic Logic Unit) The high-speed circuit in the CPU that does the calculating and comparing. Numbers are transferred from RAM (memory) into the ALU for calculation, and the results are sent back to RAM. Alphanumeric data are sent from RAM into the ALU for comparing. The results of the compare are tested and may cause the computer to go to another part of the program; for example, If ItemA equals ItemBGoToUpdateRoutine.

Floating Point Operations
A division may result in a fraction, and while some ALUs handle floating point operations, which support fractions, others do not and require a separate circuit (see math coprocessor). See DSP.

Multiple ALUs
Some chips have multiple ALUs that allow for simultaneous calculations. For example, the Adreno graphics processing unit (GPU) in Samsung's Galaxy S9+ smartphone has 256 ALUs that calculate simultaneously 710 million times per second, resulting in 727 billion floating point operations per second (727 GFLOPS). See computer, control unit and half adder.


An ALU in 1957
An arithmetic logic unit you have to sit back and admire. This floor-standing ALU was part of Honeywell's Datamatic 1000 computer. (Image courtesy of Honeywell, Inc.)







Thirty Years Later
In 1987, the ALU embedded within this 386 chip would fit on the end of a pencil eraser with room to spare. Today, an ALU takes up less space than the tip of the pencil. (Image courtesy of Intel Corporation.)
References in periodicals archive ?
The course is still under development, but the current plan is for a rigorous 5-week, graduate-level resident course to be conducted at ALU.
ALU projects that it will have five ELog Studies classes per year with 16 students per class, depending on field requests.
ALU believes this approach will overcome the educational shortfalls the Army has recently experienced and will best meet the needs of the field.
Finally, the Logistics NCO Academy, led by a command sergeant major, will be stood up in late fiscal year 2009, and the quartermaster NCO courses will transition to ALU at the same time.
One of these commanding generals will serve as the ALU commandant while simultaneously serving as the commanding general of his school.
Most of the employees assigned to ALU will begin moving into the university in April 2009 in preparation for its formal establishment in October.
Centralizing resources in ALU allows us to maximize the use of advanced training facilities, such as the Virtual Battlefield Simulation-2, Standard Army Management Information Systems, Battle Command laboratories, and distributed classroom simulations.
As ALU has moved through its standup, a key course has been the Theater Logistics Planners Program (TLog).
TLog graduates represent a small sample of the more than 30,000 students trained and educated by ALU each year.
Now that ALU has achieved its initial operating capability and the new and expanded facilities are open, relocated officer education courses are underway.
ALU began hosting the first of many Quartermaster and Ordnance BOLC III classes.
In concert with the Combined Arms Center's review of the Command Team Enterprise and the efficiencies created by relocating the three logistics branch schools to Fort Lee, ALU is exploring several options to make the best use of the time and capabilities available on the installation that will best prepare sustainment leader teams for their new command roles.